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This paper is concerned with a description of the numerous structural types of cadmium iodide that have recently been discovered. Structural data are given for the ten polytypes designated as 2 H , 4 H , 6 H  ( a ) , 6 H  ( b ) , 8 H , 10 H , 12 H  ( a ) , 12 H  ( b ) , 12 H  ( c )  and 14 H . Twenty-two other polytypes ranging from 16 H  to 64 H  are also reported, but their structures are still unknown. Nearly 50% of the 157 crystals studied have the 4 H  structure, while the remaining ones have rare or disordered structures. A definite series of related cadmium iodide structures has been discovered. This structural series that has a R amsdell  zigzag sequence represented by ‘22 … 11’ is discussed in some detail. The second part of this paper, which will appear in the future, will be concerned with an explanation of polytypism based upon the theory that the different structures result from the spiral growth of crystals as a result of screw dislocations.

Polytypism of Cadmium Iodide and its Relationship to Screw Dislocations: I. Cadmium Iodide Polytypes 1